From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrew Lunn , Vivien Didelot , "David S. Miller" , Sasha Levin Subject: [PATCH 4.14 125/159] net: dsa: mv88e6xxx: Unregister MDIO bus on error path Date: Fri, 23 Feb 2018 19:27:13 +0100 Message-Id: <20180223170758.323061227@linuxfoundation.org> In-Reply-To: <20180223170743.086611315@linuxfoundation.org> References: <20180223170743.086611315@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andrew Lunn [ Upstream commit 3126aeec5313565bfa19e2dd8fd7e3c3390514cb ] The MDIO busses need to be unregistered before they are freed, otherwise BUG() is called. Add a call to the unregister code if the registration fails, since we can have multiple busses, of which some may correctly register before one fails. This requires moving the code around a little. Fixes: a3c53be55c95 ("net: dsa: mv88e6xxx: Support multiple MDIO busses") Signed-off-by: Andrew Lunn Reviewed-by: Vivien Didelot Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/net/dsa/mv88e6xxx/chip.c | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -2153,6 +2153,19 @@ static const struct of_device_id mv88e6x { }, }; +static void mv88e6xxx_mdios_unregister(struct mv88e6xxx_chip *chip) + +{ + struct mv88e6xxx_mdio_bus *mdio_bus; + struct mii_bus *bus; + + list_for_each_entry(mdio_bus, &chip->mdios, list) { + bus = mdio_bus->bus; + + mdiobus_unregister(bus); + } +} + static int mv88e6xxx_mdios_register(struct mv88e6xxx_chip *chip, struct device_node *np) { @@ -2177,27 +2190,16 @@ static int mv88e6xxx_mdios_register(stru match = of_match_node(mv88e6xxx_mdio_external_match, child); if (match) { err = mv88e6xxx_mdio_register(chip, child, true); - if (err) + if (err) { + mv88e6xxx_mdios_unregister(chip); return err; + } } } return 0; } -static void mv88e6xxx_mdios_unregister(struct mv88e6xxx_chip *chip) - -{ - struct mv88e6xxx_mdio_bus *mdio_bus; - struct mii_bus *bus; - - list_for_each_entry(mdio_bus, &chip->mdios, list) { - bus = mdio_bus->bus; - - mdiobus_unregister(bus); - } -} - static int mv88e6xxx_get_eeprom_len(struct dsa_switch *ds) { struct mv88e6xxx_chip *chip = ds->priv;